Perfect for any natural gas or propane fire pit or fireplace applications Reflective fire glass has a dazzling mirror finish on 1 side, creating a brilliant yet elegant look in any application Fire glass will not melt, degrade or emit toxic fumes Glass size is approximately 1/4-in Remove your dirty old logs and add dazzling color and ambiance Round fire pit calculator = (diameter x diameter x glass height)/24 = glass (lbs) Rectangular fire pit/fireplace calculator = (length x depth x glass height)/19 = glass (lbs)